Preparation method of a composite oxide dry gel

A composite oxide and oxide technology, which is applied in the preparation of composite oxide dry glue, can solve the problems of rapid precipitation of zirconia or titanium oxide, affecting the physical properties and surface properties of the carrier, and different particle sizes, and achieves a large pore volume. , easy to restore, simple production process

Active Publication Date: 2014-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zirconium or titanium in the above method is added after the alumina is gelled, and the pH value of the alumina is in the alkaline range, while the zirconium-containing solution or the titanium-containing solution is acidic. When the two are mixed, it is easy to cause zirconia or titanium oxide Rapid precipitation, different particle sizes, re-peptization of the original alumina precipitation, wide particle size distribution of alumina, which in turn affects the physical and surface properties of the carrier

Method used

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  • Preparation method of a composite oxide dry gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix 1000ml 2mol / L aluminum nitrate with 22ml silica gel (containing SiO 2 25wt%), mixed with ammonia water, adjusted to a pH value of 8.5, and reacted at 60° C., and the resulting precipitate was washed and filtered to obtain a wet filter cake. 10g / 100ml of Zr(NO 3 ) 4 The solution is mixed with a theoretical amount of ammonium tartrate to obtain a complex solution. The wet filter cake was added into the complex solution and stirred vigorously, heated to 40°C for aging for 2 hours, suction filtered, and the filter cake was dried at 120°C for 3 hours and pulverized to obtain a composite oxide dry glue. The composite oxide dry glue was calcined at 600°C for 3 hours to obtain a composite oxide, in which the content of zirconia was 10 wt%, and the content of silicon oxide was 5 wt%. The main properties are listed in Table 1.

[0031] Take 131g of composite oxide dry glue, 13.9g of SB powder, add 3g of scallop powder, 5ml of dilute nitric acid, knead, extrude, dry at 120°...

Embodiment 2

[0033] Mix 1 mol / L aluminum sulfate and 1 mol / L sodium metaaluminate in parallel, adjust the pH value to 7.0, and react at 50°C. The resulting precipitate is washed and filtered to obtain a wet filter cake. 20g / 100ml of Zr(NO 3 ) 4 The solution is mixed with a theoretical amount of ammonium tartrate to obtain a complex solution. The rest are the same as in Example 1 to obtain the composite oxide dry glue. The composite oxide dry glue was calcined at 600°C for 3 hours to obtain a composite oxide, in which the content of zirconia was 50 wt%, and its main properties are listed in Table 1.

[0034] Take 118g of composite oxide dry glue, 27.8g of SB powder, add 3g of scallop powder, 3ml of dilute nitric acid and 2ml of acetic acid, knead, extrude, dry at 120°C for 3 hours, and roast at 600°C for 3 hours to obtain a composite oxide carrier .

Embodiment 3

[0036] Mix 1000ml 2mol / L aluminum nitrate with 22ml silica gel (containing SiO 2 25 wt%), mixed with ammonia water, adjusted to a pH of 7.5, reacted at 60° C. and aged for 3 hours, and the resulting precipitate was washed and filtered to obtain a wet filter cake. 10g / 100ml of TiCl 4 The solution is mixed with a theoretical amount of EDTA to obtain a complex solution. The wet filter cake was added into the complex solution and stirred vigorously, filtered with suction, and the filter cake was dried at 120° C. for 3 hours and pulverized to obtain the composite oxide dry glue. The composite oxide gel was calcined at 600° C. for 3 hours to obtain a composite oxide, wherein the content of titanium oxide was 10 wt %, and the content of silicon oxide was 5 wt %. The main properties are listed in Table 1.

[0037] Take 141g of composite oxide dry glue, 139g of SB powder, add 3g of scallop powder, 5ml of dilute nitric acid, knead, extrude, dry at 120°C for 3 hours, and roast at 600°C...

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Abstract

The invention discloses a preparation method of a composite oxide dry gel. The method comprises the following steps: 1, preparing an aluminum hydroxide wet filter cake and an aqueous solution containing a complex of IVB family metals; 2, adding the wet filter cake to the complex solution, and strongly stirring; and 3, filtering, and drying to obtain the composite oxide dry gel. According to the method, most IVB family metal oxides are distributed on the surface of alumina, so the influence of the IVB family metal oxides to the pore structure of alumina is decreased, and the co-catalysis of the IVB family metal oxides is improved, thereby advantages of alumina and the IVB family metal oxides are fully performed. The obtained composite oxide dry gel which has the characteristics of large pore volume, high specific surface area and acidic controllability is suitable as a hydrogenation catalyst carrier.

Description

technical field [0001] The invention relates to a preparation method of a composite oxide dry glue, in particular to a preparation method of a composite oxide dry glue used for preparing a hydrofining catalyst carrier. Background technique [0002] The preparation process of the alumina support is simple, the specific surface area is high, the mechanical strength is good, and the pore size is suitable. It is one of the most widely used catalyst supports at present. Inactive species, such as nickel-aluminum spinel, are less likely to form highly reactive type II active phases. Therefore, the preparation and modification of alumina carriers and the preparation of aluminum-containing composite oxides have always been the research direction of scientists. At present, group IVB metal oxides (such as zirconia, titania) have shown unique catalytic properties in the field of catalysis as supports or catalysts due to their simultaneous acidic and basic surface centers, oxidizing and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/06
Inventor 徐黎明高玉兰李崇慧陈光
Owner CHINA PETROLEUM & CHEM CORP
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